Gas transport properties of 6FDA-TMPDA/MOCA copolyimides

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• 作者：Lina Wang ; Yiming Cao ; Meiqing Zhou ; Qinhua Liu ; Xiaoli Ding ; Quan Yuan
• 关键词：6FDA copolyimide ; Permeability ; Permselectivity ; Gas separation
• 刊名：European Polymer Journal
• 出版年：2008
• 出版时间：January 2008
• 年：2008
• 卷：44
• 期：1
• 页码：225-232
• 全文大小：158 K

文摘

The gas permeation behavior of 2,2′-bis(3,4′dicarboxyphenyl) hexafluoropropane dianhydride(6FDA)-2,4,6-trimethyl-1,3-phenylenediamine (TMPDA)/4,4′-methylene bis(2-chloroaniline) (MOCA) copolyimides was investigated by systematically varying the diamine ratios. All the copolyimides were soluble in most of the common solvents. The gas permeabilities and diffusion coefficients decreased with increasing MOCA content; however, the permselectivity of gas pairs such as H₂/N₂, O₂/N₂, CO₂/CH₄ was enhanced with the incorporation of MOCA moiety. Moreover, all of the copolyimides studied in this work exhibited performance near, lying on or above the existing upper bound trade-off line between permselectivity and permeability.